<template>
  <h1>Dynamic Components</h1>
  <p>With &lt;KeepAlive include="CompOne,CompThree"&gt; only the "CompOne" and "CompThree" components will remember the user input.</p>
  <button @click="compNbr++">Next component</button>
  <KeepAlive include="CompOne,CompThree">
    <component :is="activeComp"></component>
  </KeepAlive>
</template>

<script>
  export default {
    data () {
      return {
        compNbr: 1
      }
    },
    watch: {
      compNbr(val) {
        if(val>3) {
          this.compNbr = 1;
        }
      }
    },
    computed: {
      activeComp() {
        if(this.compNbr === 1) {
          return 'comp-one'
        }
        else if(this.compNbr === 2) {
          return 'comp-two'
        }
        else {
          return 'comp-three'
        }
      }
    }
  }
</script>

<style>
  #app {
    width: 350px;
    margin: 10px;
  }
  #app > div {
    border: solid black 2px;
    padding: 10px;
    margin-top: 10px;
  }
  h2 {
    text-decoration: underline;
  }
</style>                  

<template>
    <div>
        <img :src="imgSrc">
        <h2>Component One</h2>
        <p>Choose food.</p>
        <label>
            <input type="radio" name="rbgFood" 
            v-model="imgSrc" :value="'img_apple.svg'" /> 
            Apple
        </label>
        <label>
            <input type="radio" name="rbgFood" 
            v-model="imgSrc" :value="'img_cake.svg'" /> 
            Cake
        </label>
    </div>
</template>

<script>
  export default {
    name: 'CompOne',
    data () {
      return {
        imgSrc: 'img_question.svg'
      }
    }
  }
</script>

<style scoped>
    div {
        background-color: lightgreen;
    }
    img {
        float: right;
        height: 100px;
        margin-top: 20px;
    }
    label:hover {
        cursor: pointer;
    }
</style>                  

<template>
    <div>
        <h2>Component Two</h2>
        <input type="text" v-model="msg" placeholder="Write something...">
        <p>Your message:</p>
        <p><strong>{{ this.msg }}</strong></p>
    </div>
</template>

<script>
  export default {
    name: 'CompTwo',
    data () {
      return {
        msg: ''
      }
    }
  }
</script>

<style scoped>
    div {
        background-color: lightpink;
    }
    strong {
      background-color: yellow;
      padding: 5px;
    }
</style>                  

<template>
    <div :style="{ backgroundColor: bgColor }">
        <h2>Component Three</h2>
        <p>Choose a new background-color:</p>
        <input type="color" v-model="bgColor">
        <strong>{{ this.bgColor }}</strong>
    </div>
</template>

<script>
  export default {
    name: 'CompThree',
    data () {
      return {
        bgColor: ''
      }
    }
  }
</script>

<style></style>                  

import { createApp } from 'vue'

import App from './App.vue'
import CompOne from './components/CompOne.vue'
import CompTwo from './components/CompTwo.vue'
import CompThree from './components/CompThree.vue'

const app = createApp(App)
app.component('comp-one', CompOne)
app.component('comp-two', CompTwo)
app.component('comp-three', CompThree)
app.mount('#app')